Читать книгу Anatomy for the Royal College of Radiologists Fellowship - Malcolm Sperrin - Страница 18

1 Name the arrowed structure.

2 Name the arrowed structure.

3 Name the arrowed structure.

4 Name the arrowed structure.

5 Name the arrowed structure.

Answers

1 Superior sagittal sinus.

2 Straight sinus.

3 Left sigmoid sinus.

4 Tentorium cerebelli.

5 Falx cerebri.

Comments:

The falx cerebri is a fold of dura mater which is situated in the interhemispheric fissure and divides the two cerebral hemispheres. It attaches to the crista galli anteriorly and to the tentorium cerebelli posteriorly.

The tentorium cerebelli is another fold of the dura mater, which lies above the cerebellar hemispheres. The falx cerebri splays slightly where it meets the tentorium, creating a pouch which contains the straight sinus.

Exam tip:

 Remember to read the description at the start of the question as it can give useful clues to identify structures. In this case, the information about contrast administration gives a clue that hyperattenuating structures may be vascular—namely, cerebral venous sinuses. However, bear in mind that other structures might still appear bright even though they aren’t vascular—as with the falx cerebri and tentorium in this image.